16) Which is a technique of selective plating on a particular area of component using portable equipment and anodes, usually surrounded by an absorbent material

17) Which of an element is a measure of its combining power with other atoms, when it forms chemical compounds or molecules

18) In Electrochemical Series, the electrode potential of _____ is given as zero

19) A pH value of 7 indicates a _____ solution

20) Which converts alternating current into direct current.